[CMake] How do I create a dependency to copy (touched) resource files when building an executable?

[Eric Wing]

Okay, I switched just the add_custom_target DEPENDS to the binary
directory (but left the add_custom_command alone). That seems to be
doing what I need. I think I'm still not fully understanding the
reasoning behind it, but problem solved I guess.

Thanks,
Eric


On 6/30/14, Eric Wing <ewmailing at gmail.com> wrote:
> Thanks for the reply. So the usage case is that people are going to be
> modifying the resources in the source directory. (These changes have
> to be checked into revision control.) So I'm having trouble seeing how
> depending on the binary directory is going to work. (The reason I must
> copy the resources to the binary directory is it is impossible to
> launch the application through the debugger or otherwise.)
>
> Thanks,
> Eric
>
>
> On 6/30/14, Petr Kmoch <petr.kmoch at gmail.com> wrote:
>> Hi Eric.
>>
>> It seems to me that you're copying from source dir to binary dir, but all
>> dependencies are on the source dir file only. Therefore, there is nothing
>> to trigger the generation of the binary-dir file. Perhaps you wanted
>> 'fooresources' to depend on the binary-dir file instead?
>>
>> Petr
>>
>>
>> On Mon, Jun 30, 2014 at 3:20 PM, Eric Wing <ewmailing at gmail.com> wrote:
>>
>>> I need to copy resource files from the source directory to the binary
>>> directory with the creation of my executable. I want CMake's
>>> dependency tracking to handle (re)copying these files whenever the
>>> source has been touched.
>>>
>>> Looking at other similar questions like:
>>>
>>> http://stackoverflow.com/questions/17018477/cmake-adding-custom-resources-to-build-directory
>>> and the CMake FAQ: How can I add a dependency to a source file which
>>> is generated in a subdirectory?
>>> http://www.cmake.org/Wiki/CMake_FAQ
>>>
>>> I expected the following (simplified) code to work, but it doesn't. I
>>> see the add_custom_target processed in the make chain, but the
>>> add_custom_command never triggers.
>>>
>>>
>>>
>>> project(foo)
>>>
>>> cmake_minimum_required(VERSION 2.8)
>>>
>>> add_executable(fooexe
>>>         ${CMAKE_SOURCE_DIR}/foo.c
>>>         ${CMAKE_SOURCE_DIR}/asset1.lua
>>> #       ${CMAKE_SOURCE_DIR}/subdir/subasset1.lua
>>> )
>>>
>>> add_custom_command(
>>>         OUTPUT "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INT}/asset1.lua"
>>>         COMMAND ${CMAKE_COMMAND} -E copy_if_different
>>> "${CMAKE_SOURCE_DIR}/asset1.lua"
>>> "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INT}/"
>>>         DEPENDS "${CMAKE_SOURCE_DIR}/asset1.lua"
>>>         COMMENT "Copying asset1.lua"
>>> )
>>>
>>> # files are only copied if a target depends on them
>>> add_custom_target(fooresources ALL DEPENDS
>>> "${CMAKE_SOURCE_DIR}/asset1.lua"
>>>         COMMENT "fooresources custom target"
>>>         )
>>> ADD_DEPENDENCIES(fooexe fooresources)
>>>
>>>
>>>
>>> Would somebody explain to me the correct way to handle this?
>>>
>>>
>>> Thanks,
>>> Eric
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>
>
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> Beginning iPhone Games Development
> http://playcontrol.net/iphonegamebook/
>


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http://playcontrol.net/iphonegamebook/